Well my splitter is almost finished and I have a couple of questions for you hydraulic whizzes.I went with the prince 22 gal. PTO pump and five inch cylinder and a 19 gallon tank .I am going to order my detent valve for northern hydraulics and just wanting to make sure that this is an open center system or a closed system?Hope this doesn't sound like a dumb question I just don't know alot of the terminolgy.My next question is it ok to have the filter element in a sideways mount or does the filter need to hang in a downward position.I am having some clearance issues and needs to be turned to to side if this will not cause any issues.